Microwave shows E20 and makes a loud humming or buzzing noise without heating.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Danger: This symptom indicates a serious high-voltage fault. Do not continue to operate the microwave. High-voltage repairs must be performed by qualified technicians only.
User actions:
- 1. Stop using the appliance: Unplug immediately if you hear loud humming, smell burning, or see sparks.
- 2. Inspect interior: After cooling, check the cavity, waveguide cover (mica plate), and turntable area for burn marks or metal objects.
- 3. Remove metal objects: Ensure no metal utensils, foil, or twist ties are left inside.
Resolution: A technician should inspect and replace the magnetron, HV diode, transformer, or waveguide cover as needed with IKEA-compatible parts. Do not attempt HV repairs yourself.